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2006 MPPP Meeting
NTPEP Joint and Crack Sealant Evaluation Update
Presented by Jim McGraw
NTPEP Oversight Committee
Purpose of NTPEP...
“NTPEP pools the physical and professional resources of State DOTs to
coordinate national evaluation on proprietary, engineered productsof
common interest, including a wide array of highway safety products, construction
and maintenance materials.”
NTPEP.ORG
NTPEP.ORG
NTPEP.ORG
Data Mine
• Mn/DOT hosted the first NTPEP field evaluation of Concrete Joint Sealers in September ‘03.
•3 yr field and lab evaluation
• 18 Products will be tested from 9 manufacturers.
Water InfiltrationWater Infiltration -%L = (Lf/Ltot)* 100
No Water Infiltration: %L = 0% < %L < 1%
Low Severity Water Infiltration: 1% < %L < 10%
Medium Severity Water Infiltration : 10% < %L < 30%
High Severity Water infiltration: %L > 30
•Subjective Rating for
Debris Retention
•Photos used to establish
visual rating system
Debris Retention
Seal Condition Number (SCN)
SCN –water
infiltration and
debris retention.
Low,medium, or
high severity
distress
SCN =1(L)+2(M)+3(H)
Silicone Joint Sealants
6-Non Sag Silicone
6-Self Leveling Silicone
2- 2 Component Silicone
Hot-Pour
3- ASTM D6690-Type IV- Low Modulus
30-60% Resilience for Minnesota Climate
1- Coal Tar-PVC
JS-PCC Second Year ResultsCohesion/Adhesion Loss
Hot Pour/NS/SL –3%
1/8 ” – 51%
Unsealed
Neoprene- 0.5%
2005 Crack Sealant Evaluation
September 2005
12 Hot-Pour SealantsType II/IV
Mn/DOT 3723/3725
7 Manufacturers
5 Contractors
Mn/DOT/NCPP
2005 Crack Sealant Evaluation
2001 3” OL/6”BOC
Rubblized Concrete
25-30’ crack spacing
No secondary cracks
1/16 – crack opening
21,900 AADT
2005 Crack Sealant Evaluation
Overband/Band-Aid3 ½ - 4” width
1/16- 1/8” thick
Routing9- 1” x 1”
1- ¾” x ¾”
2- 1” x ½”
Lab Testing
Tracking/RV
CS November Review
Rout Filling/tape
Wheel Track Wear
Nov. Crack Opening-1/8”
Allied Research- Joint Sealant
Extend Evaluation time
1-Neoprene
3- Unsealed
1/8” Mn/DOT 3723
Redo Mn/DOT APL
Allied Research- Crack Sealant
Control – no sealing
¾” x ¾”- Low Mod
¾” x ¾”- 3405
NTPEP Sealant Technical Committee
Next- Add Crack Filling
Add other locations
Loop Detector Sealant
LRRB Inv 822
PB-CS Selection
Construction Practices
Best Practice
New QPL/APL
Training Video Pre-con Meeting
Certification
Benefits to Mn/DOTQuick and Cheap Method to evaluate Construction and Maintenance productsEasy method to generate Approved Product ListsKeep current on new technologiesNetworking with National ExpertsAdvance expertise within Mn/DOT
Michael McGoughNTPEP Manager(202) [email protected]
Amy HearonProject Engineer(202) [email protected]
NTPEP Contacts
Questions?
